Goblin and Hobgoblin
"While goblins and hobgoblins are slightly below average among the basic foot soldier units, they are quite numerous. They attack with spiked maces." RoE manual
Heroes with a specialty
Gretchin the Barbarian has goblins as a specialty, which increases the attack and defense skills of any goblins or hobgoblins for each level attained after 1st level and gives them a speed bonus of 1.
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They have pretty high attack for a level 1 unit, and are effective attackers when in great numbers. Their speed and growth helps too.